<template>
  <nav>
    <ul class="pagination">
      <li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(current - 1)"> <i
        class="iconfont icon-zuo"></i> </a></li>
      <!--<li :class="{'disabled': current == 1}"><a href="javascript:;" @click="setCurrent(1)"> 首页 </a></li>-->
      <li v-for="(p,i) in grouplist" :key="i" :class="{'active': current == p.val}">
        <a href="javascript:;" @click="setCurrent(p.val)"> {{ p.text }} </a>
      </li>
      <!--<li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(page)"> 尾页 </a></li>-->
      <li :class="{'disabled': current == page}"><a href="javascript:;" @click="setCurrent(current + 1)"><i
        class="iconfont icon-you"></i></a></li>
    </ul>
  </nav>
</template>

<script>
  export default {
    name: 'paging',
    data () {
      return {
        current: this.currentPage
      }
    },
    props: {
      total: {// 数据总条数
        type: Number,
        default: 0
      },
      display: {// 每页显示条数
        type: Number,
        default: 10
      },
      currentPage: {// 当前页码
        type: Number,
        default: 1
      },
      pagegroup: {// 分页条数
        type: Number,
        default: 5,
        coerce: function (v) {
          v = v > 0 ? v : 5
          return v % 2 === 1 ? v : v + 1
        }
      },
      refresh: { // 不是必须 搜索后默认第一页
        type: Boolean,
        default: false
      }
    },
    computed: {
      page: function () { // 总页数
        return Math.ceil(this.total / this.display)
      },
      grouplist: function () { // 获取分页页码
        this.doRefresh()
        let len = this.page
        let temp = []
        let list = []
        let count = Math.floor(this.pagegroup / 2)
        let center = this.current
        if (len <= this.pagegroup) {
          while (len--) {
            temp.push({text: this.page - len, val: this.page - len})
          }
          return temp
        }
        while (len--) {
          temp.push(this.page - len)
        }
        let idx = temp.indexOf(center);
        (idx < count) && (center = center + count - idx);
        (this.current > this.page - count) && (center = this.page - count)
        temp = temp.splice(center - count - 1, this.pagegroup)
        do {
          let t = temp.shift()
          list.push({
            text: t,
            val: t
          })
        } while (temp.length)
        if (this.page > this.pagegroup) {
          (this.current > count + 1) && list.unshift({text: '...', val: list[0].val - 1});
          (this.current < this.page - count) && list.push({text: '...', val: list[list.length - 1].val + 1})
        }
        return list
      }
    },
    mounted () {
      this.doRefresh()
    },
    methods: {
      doRefresh () {
        if (this.refresh) {
          this.current = 1
        }
      },
      setCurrent: function (idx) {
        if (this.current !== idx && idx > 0 && idx < this.page + 1) {
          this.current = idx
          this.$emit('pagechange', this.current)
        }
      }
    }
  }
</script>
<style scoped="scoped" lang="stylus">
  @import "~styles/varibles.styl"
  .pagination {
    font-family: "sans";
    overflow: hidden;
    display: table;
    margin: 0 auto;
    height: 50px;
    li {
      float: left;
      height: 36px;
      border-radius: 50%;
      margin: 8px;
      color: #000000;
      background: white;
      &:last-child{
        a{
          background transparent
          color #333;
          .iconfont{
            font-size 23px;
            font-weight bold
          }
        }
      }
      &:first-child{
        a{
          background transparent
          color #333;
          .iconfont{
            font-size 23px;
            font-weight bold
          }
        }
      }
      a {
        display: block;
        width: 36px;
        height: 36px;
        text-align: center;
        line-height: 36px;
        font-size: 18px;
        border-radius: 50%;
        background rgba(0, 0, 0, .25);
        text-decoration: none;
        color: #fff;
      }
      &:hover {
        background: #696969;
        a {
          color: #fff;
        }
      }
      &.active a {
        background: $mainColor;
        color: #fff;
      }
      &.disabled a {
        .iconfont{
          color #999;
        }
      }
    }
  }
</style>
